📅 Originally published October 11, 2024 · Updated October 2026 ✍️ Josh ⏱️ 7 min read

We Are Dying From Our Diet

Poor diet has quietly become the number one driver of death in the United States. You won't find "bad diet" written on a death certificate, but when researchers add up what actually kills Americans and trace it back to its causes, what we eat comes out on top—ahead of smoking, alcohol, drugs, and physical inactivity. The most comprehensive analysis of U.S. health, the Global Burden of Disease study published in JAMA in 2018, ranked dietary risks as the leading risk factor for death in the country, linked to more than half a million deaths in a single year.

Meanwhile, heart disease—the condition most tightly bound to diet—remains the leading cause of death, ahead of cancer and accidents, a position it has held for about a century. This alarming situation is driven largely by poor eating habits, a lack of access to nutritious food, and a major gap in nutrition education within our healthcare system. Chronic conditions such as heart disease, diabetes, hypertension, and obesity are more common than ever, affecting millions of lives and straining the U.S. healthcare system.

This post explores the causes and consequences of diet-related diseases, the lack of nutrition education in medical training, and practical ways to reverse this health crisis.

What Are Diet-Related Diseases?

Diet-related diseases are chronic health conditions that are driven in large part by poor nutrition. They are largely preventable and include:

These illnesses have become rampant in the U.S., and many people are shocked to learn how closely they are tied to dietary habits that cut across every socioeconomic class. The overconsumption of highly processed foods, sugary drinks, salt, and processed meat, along with too few fruits, vegetables, whole grains, nuts, and legumes, are the main culprits behind this public health crisis.

One U.S. analysis estimated that about 45% of deaths from heart disease, stroke, and type 2 diabetes were associated with just ten dietary factors, led by too much sodium and processed meat and too few nuts, seeds, vegetables, and fruits.

The Scale of the Problem

The numbers tell a sobering story. According to the Centers for Disease Control and Prevention (CDC), heart disease killed 683,491 Americans in 2024, making it the leading cause of death. Stroke killed another 166,852, and diabetes was the underlying cause of 94,445 deaths (and a contributing factor in many more). Together, those three conditions accounted for about three in every ten U.S. deaths, and diet is a major driver of all three. Meanwhile, about 40% of American adults have obesity, according to the CDC's latest national survey (2021–2023). These conditions are driven largely by poor nutrition, yet they are largely preventable with better food choices and lifestyle changes.

A note on the numbers: "deaths attributable to diet" are modeled estimates, not counts, and they overlap with risk factors like high blood pressure and excess weight that diet itself helps drive. But every major analysis lands in the same place: what we eat is at or near the top of the list.

Despite the scale of the problem, the public response remains mixed, and many people face significant barriers to eating better. These include economic challenges, limited access to healthy food, and a widespread lack of understanding about why nutrition matters so much.

Lack of Nutrition Education in Healthcare

One of the most glaring issues contributing to the rise of diet-related diseases is the lack of formal nutrition education in medical training. A national survey of U.S. medical schools found that students received, on average, just 19.6 hours of nutrition instruction across their entire medical education, and only about a quarter of schools met the 25-hour minimum recommended by the National Academy of Sciences. As a result, many doctors are ill-equipped to give dietary advice or interventions to patients struggling with diet-related diseases. Instead, the medical system tends to focus on treating symptoms rather than addressing root causes.

This lack of knowledge has consequences. When physicians don't emphasize the importance of a healthy diet, patients may not fully understand the connection between what they eat and their chronic health conditions. And the healthcare system often prioritizes medication and procedures over lifestyle changes, which can further complicate the treatment of diet-related diseases.

Addressing this will require a shift in how we train healthcare providers. Nutrition education must become a core part of medical school so that doctors can better guide their patients toward healthier choices. That shift has finally begun. After a federal push in 2025, dozens of medical schools pledged in 2026 to require at least 40 hours of nutrition education starting that fall, and accrediting and licensing bodies have committed to adding nutrition to their standards and exams. Whether that produces doctors who are better at helping patients eat well remains to be seen, but the direction is right.

The Economic Burden of Diet-Related Diseases

Beyond the human toll, diet-related diseases place an enormous financial burden on the U.S. A 2021 Rockefeller Foundation analysis of the true cost of the American food system estimated the health costs of our diet at roughly $1.1 trillion a year. That figure includes direct medical expenses, such as hospital visits and medication, as well as indirect costs, such as lost productivity due to illness and disability.

Obesity, for example, is associated with an estimated $173 billion a year in excess medical costs among U.S. adults. Diabetes is even more expensive: the American Diabetes Association put its total cost at $412.9 billion in 2022. As these conditions continue to rise, the strain on the healthcare system will only worsen, potentially crowding out resources needed for other critical areas of care.

Diet-related diseases also have a significant impact on businesses. Employees with chronic conditions may need more time off to manage their health, and they often work at less than full capacity while sick. In the diabetes estimate alone, the indirect costs—missed work, reduced productivity on the job, disability, and early death—came to about $106 billion in 2022. For employers, this means higher healthcare costs and a less effective workforce.

Solutions for Change: How to Combat Diet-Related Diseases

Addressing the crisis of diet-related diseases will require a multi-pronged approach that focuses on education, access to nutritious food, and personal responsibility. Here are some key strategies.

1. Improve Access to Healthy Foods

Many Americans, particularly in low-income communities, live in areas where fresh, healthy food is hard to come by. These areas, often called "food deserts," make it difficult to maintain a nutritious diet. Improving access to affordable, healthy food is crucial for reducing diet-related disease. That can be done through policies that encourage grocery stores to open in underserved areas, by strengthening programs like the Supplemental Nutrition Assistance Program (SNAP) so low-income families can afford nutritious meals, and through "food is medicine" programs such as produce prescriptions and medically tailored meals, which are being tested in a growing number of health systems.

2. Enhance Nutrition Education

As mentioned above, medical schools need to make nutrition a real part of their curricula. Beyond that, we need to raise public awareness about the importance of healthy eating. Public health campaigns, school programs, and workplace wellness initiatives can all play a role in educating people about the dangers of poor dietary habits and the benefits of a balanced diet.

For individuals, learning how to cook healthy meals at home, read food labels, and make informed choices are critical steps in taking control of your health.

3. Promote Healthy Eating Habits

Changing the culture around food is essential to curbing diet-related diseases. Fast food and processed snacks are often more accessible and affordable than healthier alternatives, which encourages overconsumption. Public health campaigns should promote healthier choices by encouraging people to eat more fruits, vegetables, legumes, nuts, lean proteins, and whole grains. Schools and workplaces should also offer healthier meal options and wellness programs that encourage exercise and nutritious eating.

4. Focus on Prevention, Not Just Treatment

Preventing diet-related diseases before they start should be the primary goal of the healthcare system. While medical treatment is necessary for people already living with chronic conditions, promoting preventive care through better nutrition and lifestyle could dramatically reduce how many people develop these diseases in the first place. Encouraging regular physical activity and teaching people how to maintain a healthy diet are key parts of this preventive approach.

The Bottom Line

Poor diet is now the leading risk factor for death in the United States, but it doesn't have to be. With better nutrition education, better access to healthy food, and a shared commitment to eating well, we can reverse this trend and improve the health of the nation. The time for change is now, and it starts with recognizing the power of food to either harm or heal.

By making informed food choices and advocating for nutrition education, each of us can play a role in fighting diet-related disease and building a healthier future for everyone.

This article is for educational purposes only and isn't medical advice. If you have heart disease, diabetes, high blood pressure, kidney disease, or another chronic condition, or you take prescription medications, talk with your doctor or a registered dietitian before making major changes to your diet.

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Nutrition Chronic Disease Heart Disease Diabetes Public Health Food Is Medicine